INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of income before income taxes [Abstract]
Domestic				$ 13,183	$ 11,079	$ (42,179)
Foreign				3,709	(1,405)	3,259
Income (loss) before income taxes				16,892	9,674	(38,920)
Current [Abstract]
Federal				1,400	(902)	5,182
State				698	136	1,499
Foreign				2,092	602	2,493
Total current				4,190	(164)	9,174
Deferred [Abstract]
Federal				686	4,174	(7,090)
State				(464)	120	0
Foreign				(4,049)	(1,607)	(1,934)
Total Deferred				(3,827)	2,687	(9,024)
Total				$ 363	2,523	150
Federal statutory income tax rate				35.00%
The difference between income taxes computed at the federal statutory income tax rate and the provision for income taxes [Abstract]
Income taxes computed at federal statutory rate				$ 5,912	3,386	(13,622)
State income taxes, net of federal benefit				152	166	974
Non-tax deductible impairment expense computed at federal statutory rate				0	0	15,765
Foreign adjustment				255	140	689
Meals and entertainment				422	361	620
Gain on sale of Vertex				0	(1,971)	0
Domestic production activity deduction				(98)	0	(1,143)
Research and development tax credit				(641)	(886)	(1,730)
Foreign tax credit				0	(383)	(921)
Valuation allowance				(791)	0	0
Tax reform deferred tax remeasurement				(1,294)	0	0
Canadian acquisition deferred tax liability true up	$ (2,180)			(2,180)	0	0
Foreign rate difference				(297)	112	(261)
Other				(1,077)	1,598	(221)
Total				363	2,523	150
Deferred tax assets [Abstract]
Goodwill	2,668	$ 4,029		2,668	4,029
Allowance for doubtful accounts	1,707	2,469		1,707	2,469
Inventories	2,365	3,944		2,365	3,944
Accruals	(61)	97		(61)	97
Research and development credit carryforward	1,115	886		1,115	886
Foreign Tax Credit Carryforward	64	64		64	64
Charitable Contribution Carryforward	559	138		559	138
Net operating loss carryforward	136	760		136	760
Capital loss carryforward	12,225	18,903		12,225	18,903
Deferred Compensation	475	1,881		475	1,881
Other Accruals	266	0		266	0
Other	65	107		65	107
Total deferred tax assets	21,584	33,278		21,584	33,278
Less valuation allowance	(12,220)	(19,633)		(12,220)	(19,633)
Total deferred tax asset, net of valuation Deferred tax liabilities	9,364	13,645		9,364	13,645
Intangibles	(8,695)	(10,042)		(8,695)	(10,042)
Property and equipment	(6,860)	(12,762)		(6,860)	(12,762)
Unremitted foreign earnings	(354)	(354)		(354)	(354)
Cumulative translation adjustment	(67)	0		(67)	0
Other	(457)	0		(457)	0
Net deferred tax liability	(7,069)	(9,513)		(7,069)	$ (9,513)
Capital Loss Carryforward [Member]
Tax Credit Carryforward [Line Items]
Capital loss carryforward	$ 51,400			$ 51,400
Plan [Member]
Deferred [Abstract]
Federal statutory income tax rate			21.00%
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Comprehensive income - deferred tax assets change in amount		$ (8,600)				$ 4,600	$ 2,700	$ 1,300